19278967097 has 4 divisors (see below), whose sum is σ = 20761964580. Its totient is φ = 17795969616.

The previous prime is 19278967067. The next prime is 19278967111. The reversal of 19278967097 is 79076987291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79076987291 = 1583 ⋅49953877.

It can be written as a sum of positive squares in 2 ways, for example, as 5772808441 + 13506158656 = 75979^2 + 116216^2 .

It is a cyclic number.

It is not a de Polignac number, because 19278967097 - 2⁶ = 19278967033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19278967067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741498722 + ... + 741498747.

It is an arithmetic number, because the mean of its divisors is an integer number (5190491145).

Almost surely, 2^19278967097 is an apocalyptic number.

It is an amenable number.

19278967097 is a deficient number, since it is larger than the sum of its proper divisors (1482997483).

19278967097 is a wasteful number, since it uses less digits than its factorization.

19278967097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482997482.

The product of its (nonzero) digits is 24004512, while the sum is 65.

The spelling of 19278967097 in words is "nineteen billion, two hundred seventy-eight million, nine hundred sixty-seven thousand, ninety-seven".